Sentences with phrase «ice feedback in»

Not exact matches

Polyakov says a positive feedback loop is underway, in which less summer sea ice will lead to warmer winter waters and even less summer ice in subsequent years.

«Clouds are one of the major feedbacks in cooling and heating the surface» of the ice, said Nate Miller, an atmospheric science graduate student at the University of Wisconsin, Madison.

Sea ice reflects most of the sun's energy, he explained, whereas the open ocean absorbs more energy, and thus the disappearance of sea ice triggers even more warming, in a positive - feedback loop called albedo.

It is the major factor governing how much incoming solar radiation is used to melt the ice and is the main positive feedback in Arctic climate change.

Even if Pluto's ocean is really now just ice, Keane says, these new studies of Sputnik Planitia reveal a powerful and unique feedback between Pluto's climate and orbital evolution that could also operate on other icy worlds in the outer solar system.

A new study says that climate - induced feedback loops could lead to a change in ocean stratification and the more rapid melting of ice sheets.

«Greenland's ice is getting darker, increasing risk of melting: Feedback loops from melting itself are driving changes in reflectivity.»

As the ice - breaking feedback loop accelerates in years to come, more and more towering waves are likely to batter the shrinking ice cap.

Some climate scientists, including James E. Hansen, former head of the nasa Goddard Institute for Space Studies, say we must also consider slower feedbacks such as changes in the continental ice sheets.

The conclusion that limiting CO2 below 450 ppm will prevent warming beyond two degrees C is based on a conservative definition of climate sensitivity that considers only the so - called fast feedbacks in the climate system, such as changes in clouds, water vapor and melting sea ice.

It's also likely, Russell and his colleagues say, that the drying in Indonesia created a feedback loop that amplified ice age cooling.

While the ECS factors in such «fast» feedback effects as changes in water vapor — water itself is a greenhouse gas, and saturates warm air better than cold — they argued that slow feedbacks, such as changes in ice sheets and vegetation, should also be considered.

«This study was the first to quantitatively elucidate that ice - ocean albedo feedback is a primary driver of seasonal and yearly variations in Arctic sea ice retreat,» says Kay I. Ohshima.

Factoring in slow feedbacks from ice and vegetation changes would generate a significantly higher ECS, likely in the 4 to 6 C (7.2 to 10.8 F) range, the paper notes.

Given the remarkable capacity of bacteria to survive millennia frozen in ice, Feedback is tempted to add «untreated» to that description.

«Our analysis confirmed that the Planck Response plays a dominant role in restoring global temperature stability, but to our surprise we found that it tends to be overwhelmed locally by heat - trapping positive energy feedbacks related to changes in clouds, water vapor, and snow and ice,» Brown said.

The new model is the first to document and quantify this new feedback — one that is not accounted for in climate models, says Jason Box, an ice scientist at the Geological Survey of Denmark and Greenland in Copenhagen, who has documented rising impurities at a local scale during field campaigns.

By the second half of this century, rising air temperatures above the Weddell Sea could set off a self - amplifying meltwater feedback cycle under the Filchner - Ronne Ice Shelf, ultimately causing the second - largest ice shelf in the Antarctic to shrink dramaticalIce Shelf, ultimately causing the second - largest ice shelf in the Antarctic to shrink dramaticalice shelf in the Antarctic to shrink dramatically.

«The meltwater feedback cycle under the ice shelf will only slow down once the shelf has collapsed, or no more glacial ice flows in from inland to take its place.

The intensified monsoons created a positive feedback cycle, promoting more global cooling, more sea ice and even stronger precipitation, culminating in the spread of huge glaciers across the Northern Hemisphere.»

Virtually ice - free summers in the arctic sea could well arrive by 2030, with troubling implications for accelerated albedo feedback and possibly disruptive changes in the jet stream.

But lower GHGs in the last ice age were also a feedback — weren't they?

If carbon dioxide melts the Arctic sea - ice the change in water vapour will be catastrophic, because it produces a positve feedback.

Concerning sea ice: it does give a strong positive feedback which is included in all climate models.

For this subsystem, many of the longer term feedbacks in the full climate system (such as ice sheets, vegetation response, the carbon cycle) and some of the shorter term bio-geophysical feedbacks (methane, dust and other aerosols) are explicitly excluded.

I was recently asked to explain why we can use the paleo - climate record this way when it is clear that the greenhouse gas changes (and ice sheets and vegetation) in the past were feedbacks to the orbital forcing rather than imposed forcings.

The climate sensitivity classically defined is the response of global mean temperature to a forcing once all the «fast feedbacks» have occurred (atmospheric temperatures, clouds, water vapour, winds, snow, sea ice etc.), but before any of the «slow» feedbacks have kicked in (ice sheets, vegetation, carbon cycle etc.).

I guess I am surprised that with better understanding of the importance of water vapor feedback, sulfate aerosols, black carbon aerosols, more rapid than expected declines in sea ice and attendant decreases in albedo, effects of the deposition of soot and dust on snow and ice decreasing albedo, and a recognition of the importance of GHGs that were probably not considered 30 years ago, that the sensitivity has changed so little over time.

Anyone who accepts that sunlight falling on ice free waters which has less reflectivity than sunlight falling on a large ice mass covering those waters and also accepts that this reduction in albedo has a positive feedback effect, leading to further warming, can't help but opt for A or B, it seems to me.

In particular I am interested in boreal permafrost feedbacks such as thawing permafrost, burning boreal forests... do these feedbacks overtake man made emissions scales and were these considered in the report findings such as shrinking sea ice was (hopefullyIn particular I am interested in boreal permafrost feedbacks such as thawing permafrost, burning boreal forests... do these feedbacks overtake man made emissions scales and were these considered in the report findings such as shrinking sea ice was (hopefullyin boreal permafrost feedbacks such as thawing permafrost, burning boreal forests... do these feedbacks overtake man made emissions scales and were these considered in the report findings such as shrinking sea ice was (hopefullyin the report findings such as shrinking sea ice was (hopefully)?

Alexeev, V.A., P.L. Langen, and J.R. Bates, 2005: Polar amplification of surface warming on an aquaplanet in «ghost forcing» experiments without sea ice feedbacks.

This mitigates the albedo feedback, as does the lowering in sea level that accompanies the formation of ice sheets.

So it currently includes a [positive] contribution from the ice - albedo feedback, because our current climate possesses sea - ice that will be melted by a modest increase in temperatures.

Sea ice melt impacts local and global temperatures in a feedback loop.

It is important to remind everyone that i) we expect CO2 to lag behind temperature in ice core records, because of feedbacks, and ii) that the Antarctic cores are not a global temperature record.

He then uses what information is available to quantify (in Watts per square meter) what radiative terms drive that temperature change (for the LGM this is primarily increased surface albedo from more ice / snow cover, and also changes in greenhouse gases... the former is treated as a forcing, not a feedback; also, the orbital variations which technically drive the process are rather small in the global mean).

They got 10 pages in Science, which is a lot, but in it they cover radiation balance, 1D and 3D modelling, climate sensitivity, the main feedbacks (water vapour, lapse rate, clouds, ice - and vegetation albedo); solar and volcanic forcing; the uncertainties of aerosol forcings; and ocean heat uptake.

This feedback could potentially result in the rapid loss of parts of the ice sheet, as grounding lines retreat along troughs and basins that deepen towards the ice sheet's interior.

This empirical fast - feedback climate sensitivity allows water vapor, clouds, aerosols, sea ice, and all other fast feedbacks that exist in the real world to respond naturally to global climate change.

There was more ice around in the LGM and that changes the weighting of ice - albedo feedback, but also the operation of the cloud feedback since clouds over ice have different effects than clouds over water.

Climate forcing in the LGM equilibrium state, relative to the Holocene, due to the slow feedback ice age surface properties, i.e., increased ice area, different vegetation distribution, and continental shelf exposure, was -3.5 ± 1 W / m2 (10).

Thicker ice in deeper water drives increased calving, increased ice discharge, and further grounding - line recession in a positive feedback loop2, 3.

The main feedbacks between climate and the ice sheet arise from changes in ice elevation, atmospheric and ocean circulation, and sea - ice distribution.

In this case, incursions of circumpolar deep water onto the continental shelf are melting the ice stream at its base and encouraging grounding line recession, which results in a positive feedback loop and further grounding line recessioIn this case, incursions of circumpolar deep water onto the continental shelf are melting the ice stream at its base and encouraging grounding line recession, which results in a positive feedback loop and further grounding line recessioin a positive feedback loop and further grounding line recession.

That influence could potentially trigger feedbacks resulting in greater ice melt in Greenland and with it, higher sea level rise.

Sony is interested in user feedback after posting an initial beta Ice Cream Sandwich ROM for the Sony (Ericsson, back then) Xperia Play.

V - MODA claims that their patented dual diaphragm drivers for the Crossfade M100 are more well rounded and balanced out in sound than their LP series of headphones thanks to over 200 musical professionals and audio enthusiast feedback; using a port system for what they call «3D Airflow» to increase sound - stage, detail and clarity as icing on the cake.

For example, Nintendo's more precise haptic feedback can simulate ice cubes entering the controller in a minigame — you can actually feel the «cup» fill with water.

In the future, I would look forward to another Sonic Boom title if Sanzaru Games was once again at the helm, provided they can be just as effective in incorporating feedback for that new game as they have proven to be with Fire & IcIn the future, I would look forward to another Sonic Boom title if Sanzaru Games was once again at the helm, provided they can be just as effective in incorporating feedback for that new game as they have proven to be with Fire & Icin incorporating feedback for that new game as they have proven to be with Fire & Ice.

[1] CO2 absorbs IR, is the main GHG, human emissions are increasing its concentration in the atmosphere, raising temperatures globally; the second GHG, water vapor, exists in equilibrium with water / ice, would precipitate out if not for the CO2, so acts as a feedback; since the oceans cover so much of the planet, water is a large positive feedback; melting snow and ice as the atmosphere warms decreases albedo, another positive feedback, biased toward the poles, which gives larger polar warming than the global average; decreasing the temperature gradient from the equator to the poles is reducing the driving forces for the jetstream; the jetstream's meanders are increasing in amplitude and slowing, just like the lower Missippi River where its driving gradient decreases; the larger slower meanders increase the amplitude and duration of blocking highs, increasing drought and extreme temperatures — and 30,000 + Europeans and 5,000 plus Russians die, and the US corn crop, Russian wheat crop, and Aussie wildland fire protection fails — or extreme rainfall floods the US, France, Pakistan, Thailand (driving up prices for disk drives — hows that for unexpected adverse impacts from AGW?)